PT - JOURNAL ARTICLE AU - Richard Roll TI - Performance evaluation and benchmark errors (I) AID - 10.3905/jpm.1980.408760 DP - 1980 Jul 31 TA - The Journal of Portfolio Management PG - 5--12 VI - 6 IP - 4 4099 - https://pm-research.com/content/6/4/5.short 4100 - https://pm-research.com/content/6/4/5.full